How much concrete is needed for 400 sq ft 4 inches thick?

Answer 1

First convert the thickness, 4 inches to feet so we are using the same units for sq ft and thickness. That is 4 inches is 4/12 ft or 1/3 ft Then multiply the sq ft by the thickness to get the cubic measure. That is 400 sq ft by 1/3 ft = 133.33 cu ft. Convert that to cubic yards. Since there is 3 ft to a yard, there are 3 x 3 x 3 = 27 cu ft in a cubic yard. So divide the cu ft by 27 to arrive at cu.yds. That is 133.33/27 = 4.94 cu yards say 5 cubic yards. If the result is required in cubic meters then multiply by 0.765. That is 4.94 x 0.765 = 3.78 cubic meters

Answer 2

5 YARDS